PS5 in Performance Mode uses a dynamic resolution with the highest resolution found being 3840x2160 and the lowest resolution found being approximately 2062x1160. Pixel counts at 3840x2160 seem to be very rare on PS5 in Performance Mode.
Xbox Series X in Performance Mode uses a dynamic resolution with the highest resolution found being 3840x2160 and the lowest resolution found being approximately 2062x1160. Pixel counts at 3840x2160 seem to be very rare on Xbox Series X in Performance Mode.
Below are some example pixel counts for certain scenes on PS5 and Xbox Series X in Performance Mode. Note that these figures are approximate and not necessarily representative of how the entirety of a given area will render.
Kabuki Entrance - PS5 2176x1224, Series X 2304x1296
Near Police Station - PS5: 2435x1370, Series X: 2560x1440
Outside Tom's Diner - PS5: 2506x1410, Series X: 2631x1480
Corpo Start Building - PS5: 2656x1494, Series X: 2744x1544
Streetkid Start - PS5: 2062x1160, Series X: 2062x1160
The Xbox Series consoles appear to be using VRS. FSR appears to be used to upscale the image to 3840x2160 on PS5 and Series X in both modes and 2560x1440 on Series S. The UI resolution is also rendered at 3840x2160 on PS5 and Series X in both modes and 2560x1440 on Series S.